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This isn't normal. There is a rattling of sort, it's either a loose bolt of sump guard/bracket or come what may. Have you installed an after market sump guard? When was the bike last serviced, and do you have the right oil level?
 

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Seems it's not from inside the engine. It's like a bolt is loose, exhaust maybe? Or maybe something inside the exhaust is broken. Hit the exhaust while engine is turned of and cold.

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